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Tractor · 1938Unverified

Allis Chalmers B

Name: Allis Chalmers B
Brand: Allis Chalmers

Allis Chalmers B — Row-Crop tractor · 20 hp. Reference specifications; pending source verification.

The Allis Chalmers B is a compact tractor with a rated output of 20 hp, making it a suitable option for smaller-scale farming operations. It was manufactured from 1938 to 1957 and features a 4-cylinder petrol liquid-cooled engine, transmitting power to the wheels via a 3-speed gearbox and two-wheel drive system. The model has a listed weight of 934 kg and is designed to handle tasks on plots of up to 200 acres.

Provisional listing — the headline figure is shown; full specifications are auto-generated and pending verification against published sources.

Rated power

20 hp

Max power

9.7 kW

Weight

934 kg

Catalogue coverage

Variants represented

Richest spec table

141 rows

Recorded power

20 hp

Recorded weight

934 kg

Transmissions

3-speed unsynchronized gear

Production years

1938-1957

Verified variants

No linked source document is currently displayed; verify critical figures with the manufacturer or dealer.

Hover a source tag to verify

Overview

ManufacturerAllis ChalmersReference

Row-Crop tractorReference

FactoriesWest Allis, Wisconsin, USAReference

FactoriesSouthampton, EnglandReference

Total built120,783Reference

Original price was $1,500 in 1957Reference

The Allis-Chalmers model B was the result of research by Harry Merritt, Allis tractor division manager, into U.S. farm sizes in the early 1930s. At that time, most tractors were being used on farms larger than 100 acres, while more than half of all farms were under 100 acres. The Allis B was specifically designed to enter into the small-farm market, and early literature focused on the economy of using tractors instead of horses.Reference

Two-wheel driveReference

SteeringmanualReference

Differential mechanical contracting band brakesReference

Open operator station. Canvas cab optional.Reference

Variants

IBindustrial tractorReference

Engine

Allis-Chalmers 2.1L 4-cyl gasolineReference

Allis-Chalmers 1.9L 4-cyl gasolineReference

Waukesha 1.9L 4-cyl gasolineReference

Fuel tank45.4 LReference

Plows1 (16-inch)Reference

Drawbar (tested)14.5 kWReference

Belt (tested)16.6 kWReference

Allis-Chalmers CEReference

gasolineReference

4-cylinderReference

liquid-cooledReference

Final engine, used from 1943 on, SN 64501Reference

Displacement2.1 LReference

Bore/Stroke86 x 89 mmReference

Air cleaneroil bathReference

Compression5.75:1Reference

Rated RPM1500Reference

Firing order1-2-4-3Reference

Starter volts6Reference

Oil capacity3.8 LReference

SparkplugAutolite AN 7Reference

SparkplugAC 45Reference

Sparkplug gap0.889 mmReference

Point gap0.508 mmReference

Intake valve clearance0.254 mmReference

Exhaust valve clearance0.254 mmReference

Allis-Chalmers BEReference

liquid-cooled vertical I-headReference

Second engine, used until 1943, SN 64500Reference

Displacement1.9 LReference

Bore/Stroke83 x 89 mmReference

Compression4.92:1Reference

Rated RPM1400Reference

Coolant capacity7.6 LReference

Sparkplug gap1.016 mmReference

WaukeshaReference

Original engine, used in 1937 on the first 96 tractors builtReference

Displacement1.9 LReference

Bore/Stroke76 x 102 mmReference

Belt power (max)11.7 kWReference

Max power9.7 kWReference

Belt power (max)16.6 kWReference

Max power14.5 kWReference

Transmission

3-speed unsynchronized gearReference

Typeunsynchronized gearReference

Gears3 forward and 1 reverseReference

Clutchdry discReference

Oil capacity5.7 LReference

Oil type[0oC]Reference

32oF [0oC]↑: SAE140Reference

32oF [0oC]↓: SAE90Reference

PTO & Hydraulics

TypeAllis Snap CouplerReference

Rear PTOtransmissionReference

Rear PTO Type560Reference

Dimensions

Wheelbase186 cmReference

Weight934 kgReference

Front tire4.00-15Reference

Rear tire9-24Reference

Ag front4.00-15Reference

Ag rear9-24Reference

Ag rear10-24Reference

Ag rear7-28 (Potato Special)Reference

Ag rear8-38 (Asparagus Special)Reference

Length280 cmReference

Width133 cmReference

Width157 cmReference

Height (exhaust)194 cmReference

Shipping weight934 kgReference

Ballasted weight1901 kgReference

Ground clearance55 cmReference

Ground clearance71 cmReference

Front tread106 cmReference

Front tread96 to 152 cmReference

Rear tread101 to 132 cmReference

Rear tread101 to 152 cmReference

B Serial Number Location

On top of transmission case, by shift lever. English-built models have an 'EB' serial number.Reference

B Serial Numbers

193897Reference

193911800Reference

194033502Reference

194149721Reference

194256782Reference

194364501Reference

194465502Reference

194570210Reference

194672265Reference

194773370Reference

194880556Reference

194992295Reference

1950102393Reference

1951114527Reference

1952118674Reference

1953122310Reference

1954124201Reference

1955124711Reference

1956126497Reference

1957127186Reference

Final127461Reference

19461001 (IB)Reference

19471003 (IB)Reference

19481010 (IB)Reference

19491282 (IB)Reference

19501556 (IB)Reference

19511879 (IB)Reference

19522219 (IB)Reference

19532570 (IB)Reference

19514001 (EB)Reference

19526861 (EB)Reference

19539200 (EB)Reference

195411120 (EB)Reference

FAQ: How to read a serial number table.Reference

Capacities

Diameter20 cmReference

Width13 cmReference

RPM1053Reference

Electrical

GroundpositiveReference

Charging systemgeneratorReference

Charging amps12Reference

Battery volts6Reference

Test results

NTTL 302: 116 ci gas 3-speed 2WDReference

NTTL 439: 125 ci gas 3-speed 2WDReference

116 ci gas 3-speed 2WDMay 31 - June 8, 1938Link: Nebraska Tractor Test 302 fileReference

Belt fuel use (max)5.7 l/hourReference

Drawbar performanceReference

Gear 2 used for power test.Reference

Max pull668 kgReference

Gear 2 used for pull test.Reference

125 ci gas 3-speed 2WDMay 17 - 24, 1950Link: Nebraska Tractor Test 439 fileReference

Belt fuel use (max)7.9 l/hourReference

Max pull1209 kgReference

Gear 1 used for pull test.Reference

Values normalized to UK metric units. Every figure is traced to at least one source; verified specs are cross-checked against two or more.

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